Re: [PATCH v2 20/28] KVM: x86/mmu: Use atomic ops to set SPTEs in TDP MMU map

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Subject: Re: [PATCH v2 20/28] KVM: x86/mmu: Use atomic ops to set SPTEs in TDP MMU map
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Mon, 8 Feb 2021 11:32:17 +0100
Cc: Ben Gardon <bgardon@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, Peter Xu <peterx@xxxxxxxxxx>, Peter Shier <pshier@xxxxxxxxxx>, Peter Feiner <pfeiner@xxxxxxxxxx>, Junaid Shahid <junaids@xxxxxxxxxx>, Jim Mattson <jmattson@xxxxxxxxxx>, Yulei Zhang <yulei.kernel@xxxxxxxxx>, Wanpeng Li <kernellwp@xxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Xiao Guangrong <xiaoguangrong.eric@xxxxxxxxx>
In-reply-to: <YB3iUde728MPiuo9@google.com>
References: <20210202185734.1680553-1-bgardon@google.com> <20210202185734.1680553-21-bgardon@google.com> <81f13e36-b2f9-a4bc-ab8e-75cedb88bbb1@redhat.com> <YB3iUde728MPiuo9@google.com>
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On 06/02/21 01:26, Sean Christopherson wrote:

We could fudge around it via #ifdef around the xchg().  Making all of tdp_mmu.c
x86-64 only would be nice to avoid future annoyance, though the number of stubs
required would be painful...


It's really just a handful, so it's worth it.

Paolo

References:
- [PATCH v2 00/28] Allow parallel MMU operations with TDP MMU
  - From: Ben Gardon
- [PATCH v2 20/28] KVM: x86/mmu: Use atomic ops to set SPTEs in TDP MMU map
  - From: Ben Gardon
- Re: [PATCH v2 20/28] KVM: x86/mmu: Use atomic ops to set SPTEs in TDP MMU map
  - From: Paolo Bonzini
- Re: [PATCH v2 20/28] KVM: x86/mmu: Use atomic ops to set SPTEs in TDP MMU map
  - From: Sean Christopherson

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